Tahu, Lewa, Pohatu Fingers?

What were the left hands of Tahu and Lewa and both hands of Pohatu supposed to be. I know the pieces were needed to make the kaita. But what were they canon wise. Were the meant to be hands with fingers. Kopaka didn't have one cause he needed to hold a shield and Gali and Onua had dual weapons.

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I am Takanui Nuva. The Toa Nuva of Light I also go by Baron Von Brickenstein

Even when things look there worst. And the shadow of evil is upon us. Remember that as long as we hope for the best. Light will appear and overcome the darkness.